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Finding the Fourth Proportional to 612.71, 845.64 and 392.19

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Solution

The fourth proportional to 612.71, 845.64 and 392.19 is: 541.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.71 : 845.64 = 392.19 : x
  2. Step 2: Convert to fraction form
    612.71/845.64 = 392.19/x
  3. Step 3: Cross multiply
    612.71x = 845.64 × 392.19
  4. Step 4: Simplify right side
    612.71x = 331,653.14
  5. Step 5: Solve for x
    x = 331,653.14/612.71
  6. Step 6: Final answer
    x = 541.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.